Sybil Morgan-Gray · Prevention of Future Deaths report

The inquest into Sybil Morgan-Gray’s death was opened on 22 August 2023 and concluded on 2 May 2025.

I reached a narrative conclusion that her death was caused by recognised complications of a necessary surgical procedure

Ms Morgan-Gray was admitted to hospital when concerns were raised regarding the vascular supply in her lower limbs. She underwent surgical procedures to address this. However, she was later admitted to Intensive Care after developing Stercoral Colitis, for which she required a total colectomy.

She had previously been diagnosed with diabetes mellitus and suffered episodes of hypoglycaemia whilst in hospital. She was noted to have suffered another episode of hypoglycaemia on 24 April 2022, which was addressed. However, she did not have further blood glucose results analysed until after 3am the next morning (despite entries in the records, which were seemingly falsely filed). Two results were obtained via blood gas analysis within minutes of each other. Both showed an unrecordably low glucose but subsequent action was not taken, based on these results.

I heard evidence that most medical staff are aware that blood gas analysers show an unrecordably low glucose as ‘- - -’ but that this can be interpreted as meaning that the sample was not analysable.

Ms Morgan-Gray’s hypoglycaemia was not recognised for several hours, by which time she had suffered a consequential brain injury.

This condition contributed to her death but the direct cause was an infection arising from her earlier abdominal surgery. She died on 15 May 2022.

1. A concern regarding the interpretation of blood gas machine readings. Specifically, when blood glucose levels are unrecordably low, the machines report this as ‘- - -’. This display can be misinterpreted as indicating the sample is unanalysable, rather than accurately reflecting an extremely low glucose level. This misinterpretation could lead to delayed or inappropriate clinical responses, potentially resulting in future deaths.

It was unclear why the results are not recorded as ‘Low’ or similar.

As the regulator of medical devices, I made the decision to write this report to you, rather than an individual manufacturer, as I believe you have the power to direct all manufacturers of such devices to ensure they provide clear and easily interpretable results.